Halimi, Abderrahim and Mailhes, Corinne and Tourneret, Jean-Yves and Snoussi, Hichem Bayesian Estimation of Smooth Altimetric Parameters: Application to Conventional and Delay/Doppler Altimetry. (2016) IEEE Transactions on Geoscience and Remote Sensing, 54 (4). 2207-2219. ISSN 0196-2892
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(Document in English)
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Official URL: http://dx.doi.org/10.1109/TGRS.2015.2497583
Abstract
This paper proposes a new Bayesian strategy for the smooth estimation of altimetric parameters. The altimetric signal is assumed to be corrupted by a thermal and speckle noise distributed according to an independent and non-identically Gaussian distribution. We introduce a prior enforcing a smooth temporal evolution of the altimetric parameters which improves their physical interpretation. The posterior distribution of the resulting model is optimized using a gradient descent algorithm which allows us to compute the maximum a posteriori estimator of the unknown model parameters. This algorithm has a low computational cost that is suitable for real-time applications. The proposed Bayesian strategy and the corresponding estimation algorithm are evaluated using both synthetic and real data associated with conventional and delay/Doppler altimetry. The analysis of real Jason-2 and CryoSat-2 waveforms shows an improvement in parameter estimation when compared to state-of-the-art estimation algorithms.
Item Type: | Article |
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Additional Information: | Thanks to IEEE editor. The definitive version is available at http://ieeexplore.ieee.org/ The original PDF of the article can be found at : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7365427 |
HAL Id: | hal-01311346 |
Audience (journal): | International peer-reviewed journal |
Uncontrolled Keywords: | |
Institution: | French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE) Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE) Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE) Université de Toulouse > Université Toulouse - Jean Jaurès - UT2J (FRANCE) Université de Toulouse > Université Toulouse 1 Capitole - UT1 (FRANCE) Other partners > Université de Technologie de Troyes - UTT (FRANCE) |
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Deposited On: | 04 May 2016 08:41 |
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